Re: [Java-player-users] Complete freeze of stage?

[John O. <joh...@gm...>]

I am afraid I have never experienced anything like this. First question
would be what version of player/stage are you using? If you read back
through the mail archives people have been having issues with player/stage
2.1, so you may want to downgrade your player/stage version until this is
resolved.

Otherwise if there is any more information such as error messages from P/S
you could provide it would be helpful.

I wasn't entirely sure from what you said if multiple executors were reading
from a given port,  since if you have the system in PULL mode multiple
clients reading the same port could also cause issues.

thanks

John


2008/4/30 Anthony Harrison <ant...@nr...>:

> I'm not entirely sure where this problem is being caused, but here's
> the situation:
>
> I've got stage configured with two robots and a connection to the
> simulation interface. After about five minutes stage freezes up
> entirely and the javaclients do as well (freezing on readAll()). (but
> my other code continues to chug along).
>
> What makes this interesting is that after killing the javaclients,
> stage resumes, which leads me to believe a communications buffer might
> be flooded.
>
> Has anyone experienced something similar?
>
> Now I am doing things a tad differently. First, I'm not running
> threaded. Instead I'm using executors to parallelize a large amount of
> the processing. At the top of each iteration, readAll() is called for
> each bot, and then separate executors do the sensor processing. After
> all the sensors are processed then new commands are issued (on the
> same thread that did the reading so there is no concern about sending
> munged commands due to different threads writing to the port).
>
> The PlayerClients are instantiated as normal but I make no calls to
> runThreaded() or setNotThreaded() (since it defaults to not threaded).
>
>
>
>
>  ...
>  Anthony M. Harrison, PhD
>  Cognitive Robotics & Human-Robot Interaction
>  Naval Research Laboratory
>
>
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